US4124422A - Method of producing flexible pipe with socket section - Google Patents

Method of producing flexible pipe with socket section Download PDF

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Publication number
US4124422A
US4124422A US05/685,152 US68515276A US4124422A US 4124422 A US4124422 A US 4124422A US 68515276 A US68515276 A US 68515276A US 4124422 A US4124422 A US 4124422A
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Prior art keywords
end portion
pipe
socket element
socket
elastic member
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Expired - Lifetime
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US05/685,152
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English (en)
Inventor
Hiroshi Kusano
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Kubota Corp
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Kubota Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts
    • Y10T29/49872—Confining elastic part in socket

Definitions

  • the present invention relates to a flexible pipe with a socket section and more particularly it relates to a flexible pipe with a socket section of the type wherein a FRP (fiber-reinforced plastics) pipe, a thermosetting resin pipe, a composite pipe having inner and outer layers formed of said pipe materials and an intermediate layer formed of resin mortar, or other straight flexible pipe which cannot be or can hardly be subjected to a secondary processing operation has a socket member integrally attached to one end portion thereof. It also relates to a method of producing the same.
  • FRP fiber-reinforced plastics
  • a batch system for the production of flexible pipes having integral socket sections, usually a batch system is employed in which articles are produced one by one by using a mandrel having an outer surface conforming to the shape of the pipes to be produced or a hollow cylindrical mold having an inner surface conforming to said shape.
  • Such batch system has the drawback that the productivity is low.
  • straight pipes are produced by a continuous forming process or the like and one end of a collar having socket sections on the opposite sides thereof and a pipe end positioning annular projection on the middle inner surface region thereof is fitted over one end of a straight pipe of predetermined length with a seal rubber ring interposed therebetween, whereby such pipe is used as a flexible pipe with a socket section or a substitute therefor.
  • the complicated shape of the collar results in the increased total man-hour while the provision of socket sections on the opposite sides incurs a high cost of materials, so that the product is expensive.
  • a method has also been proposed in which a socket member forming a socket section is formed on the outer surface of one end portion of said straight pipe in such a manner that part of the socket member overlaps the latter.
  • the resulting sealing quality of the junction between the straight pipe and the socket member and the resulting junction strength are insufficient, bringing about drawbacks including the leakage of pipeline fluid particularly under high pressure, and the separation in the junction between the straight pipe and the socket member due to the difference in the amount of flexure between them when the pipe is deformed under soil pressure.
  • principal object of the present invention is to provide a flexible pipe with a socket section which is capable of solving all the various problems described above, and a method of producing the same.
  • the present invention provides a method of producing a flexible pipe with a socket section wherein one end of a straight pipe of predetermined length consisting of a flexible pipe is either intetrally formed or fitted with a socket member in such a manner that they partially overlap each other, said method being characterized in that the straight pipe and the socket member are made integral with each other in such a manner that at the junction between the straight pipe and the socket member an internal stress is acting to provide a force fit therebetween.
  • straight pipes which can be produced with high productivity are used and such straight pipe is integrated at one end portion thereof with a socket member.
  • such flexible pipes with socket members can be provided at low costs.
  • the straight pipe and the socket member are integrated with each other with an elastic member interposed between the outer surface of one end portion of the straight pipe and the overlap inner surface of the socket member.
  • the elastic member interposed between the one end portion of the straight pipe and the socket member precludes the possibility of the rigidity of the socket section being particularly increased, with two such flexible pipes connected together the socket section of one pipe and the plug section of the other pipe inserted in said socket section will deform to substantially the same degree, so that there will be little danger of the clearance between the socket section and the plug section becoming non-uniform, thus providing a satisfactory sealing at the joint, obviating the danger of the pipeline fluid leaking through the joint.
  • FIG. 1 is a longitudinal section of a first embodiment
  • FIG. 2 is a section of a flexible pipe with a socket section produced by the method of the first embodiment
  • FIG. 3 is a longitudinal section of a modification of the first embodiment
  • FIGS. 4a through 4f are sectional views showing various modifications of the elastic member.
  • FIGS. 1 and 2 designated at 1 is a socket section, which is formed in such a manner that one end portion 3a of a socket member 3 is fitted over one end portion 2a of a straight pipe 2 and in this condition the pipe and socket member are integrated together.
  • an elastic member 4 is interposed between the portions 2a and 3a in the overlap region.
  • a buffer 6 such as a rubber ring between the jig 5 and the outer surface of the straight pipe one end portion 2a so as to assure uniform circumferential clamping.
  • the amount of reduction in diameter is suitably of the order of 1/300-1/3,000 of the pipe diameter.
  • an adhesive is applied to the outer surface of the diametrically reduced straight pipe one end portion 2a. If the straight pipe 2 is a filament winding pipe (FW pipe) formed by winding resin-impregnated glass fibers, since the outer pipe surface presents a difficultly-adherent surface condition it is desirable to polish the outer surface as by a grinder prior to the application of said adhesive.
  • FW pipe filament winding pipe
  • An elastic member 4 such as rubber packing is then fitted over the straight pipe one end portion 2a, whereby the elastic member 4 is adhesively fixed in position. If such elastic member 4 employed has an inner diameter about 10% smaller than the outer diameter of the straight pipe 2 so that it is fitted thereover in a stretched condition, then the tension in the elastic member 4 cooperates with the adhesive power of the adhesive to improve the joining force and water-tightness.
  • a socket member forming mandrel 7 is brought against a straight pipe end surface 2b and resin-impregnated glass fiber is wound around the outer surface of said elastic member 4 and the outer surface of said mandrel 7, thereby forming a socket member 3 of predetermined thickness.
  • the mandrel 7 is heated by suitable means or other suitable heating method is used to thermally set the resin.
  • the clamping jig 5 is loosened and removed while withdrawing the mandrel 7, whereupon the diametrically reduced straight pipe one end portion 2a tends to elastically resume its original condition, with the resulting diametrically expanding force causing the straight pipe one end portion 2 to be fitted under pressure in the one end portion 3a of the socket member 3 through the elastic member 4, so that the two members are strongly joined together as assisted by the adhesive or by the adhesion of the resin material of the socket member 3, thus, providing a pipe having a socket section 1 integral therewith as shown in FIG. 2.
  • Such flexible pipe with a socket receives the other end portion 2c of another such flexible pipe through a packing 8, as shown in phantom lines in FIG. 2.
  • flexible pipes are connected together for piping work.
  • the flexible pipes deform about 5% under soil pressure.
  • the straight pipe 2 and the socket member 3 are bonded together by the adhesive with an internal stress acting to provide a force fit therebetween, they are joined together so strongly that there is no danger of separation taking place in the interface between the straight pipe 2 and the socket member 3.
  • the elastic member 4 is useful particularly for underground piping work in soft ground.
  • FIG. 1 While the embodiment shown in FIG. 1 has used a clamping jig 5 and a buffer 6 for reduction in the diameter of one end portion 2a of a straight pipe 2, an alternative method of diametrical reduction is shown in FIG. 3, wherein a hollow annular body 8 having a deformable cross-section is fitted over one end portion 2a of a straight pipe and a pressure receiving jig 9 for preventing the diametrical expansion of the outer diameter of said body is fitted over the outer surface of said hollow annular body 8, whereupon pressurized fluid is forced into the hollow 10 of the hollow annular body 8 so as to reduce its inner diameter, thereby clamping the straight pipe one end portion 2a to reduce its diameter.
  • the hollow annular body 8 When pressurized fluid is forced into the hollow 10 with the hollow annular body 8 fitted over the straight pipe one end portion 2a and with the pressure receiving jig 9 fitted over said hollow annular body, the hollow annular body 8 deforms from a flat to a circular shape in its cross-section and along with this deformation the hollow annular body 8, whose outer diameter is held by the pressure receiving jig 9, is caused to have its inner diameter reduced, whereby the straight pipe one end portion 2a is elastically reduced in diameter.
  • a socket member 3 is formed and allowed to set, whereupon the pressurized fluid in the hollow 10 of the hollow annular body 8 is discharged for removal of the hollow annular body 9 and pressure receiving jig 9 and for withdrawal of the mandrel 7.
  • the necessary device and the operation involved are very simple and yet the straight pipe one end portion 2a can be clamped with a uniform force throughout the periphery and reduced in diameter.
  • An elastic member such as shown at 4 has been interposed between the straight pipe one end portion 2a and the socket member 3, but without using such elastic member 4 the socket member 3 may, of course, be directly formed on or fitted over the straight pipe one end portion 2a.
  • the shape and construction of the elastic member may be other than those shown in FIGS. 1 and 2 various forms shown in FIGS. 4a through 4f may be used.
  • FIG. 4b shows an elastic member 4 having a cylindrical outer surface and a square projection 13 formed thereon. It is possible to use one having a tapered outer surface 4a with no projection formed thereon, as shown in FIG. 4c, or one having a rectangular cross-section, as shown in FIG. 4d. Further, as shown in FIG. 4e, the elastic member 4 may be formed with a plurality of undulations 14 on the outer surface thereof so that the elastic member 4 and the socket member 3 axially engage each other, the increased area of contact improving the adhesion.
  • the outer surface and/or inner surface of the elastic member 4 may be treated with hydrochloric acid or, as shown in FIGS. 4a through 4f, the outer surface 4a and/or inner surface 4b may be desirably provided with junction layers 15 formed of rubber or other material which provides satisfactory adhesion between the straight pipe 2 or socket member 3 and the elastic member 4.
  • junction layers 15 may be formed by adhesion or extrusion simultaneously with the extrusion formation of the elastic member 4.
  • the outer surface of the elastic member 4 may be provided with a resin layer 16 formed of the same material as that of the socket member or a resin or a resin-impregnated reinforced fiber which has an affinity for the material of the socket member.
  • the outer surface 4a but also the inner surface 4b may be formed with said resin layers, as required. Further, when there is the danger of the elastic member 4 being attacked by the material of the socket member 3 when the latter is formed, it is necessary to use a resin for the resin layer 16 which is resistant to the socket member forming resin.
  • thermoplastic resin type adhesives or mixtures thereof may be used, but the use of epoxy resin type and polyurethane type adhesives is advantageous since they are thermosetting resin type adhesives and do not need the use of solvents.
  • the elastic member 4 any materials that are usually used as sealing materials may be used. For example, natural rubber, and synthetic rubbers including chloroprene rubber, acrylic rubber and nitryl rubber may be used, and those having synthetic resin incorporated therein or those reinforced by fabric, metal or the like may sometimes be used.
  • the straight pipe one end portion 2a is reduced in diameter by a press mold 18 enclosing and contacting a socket member 17 consisting of unset resin, and in this condition the socket member 17 is allowed to set, whereby the straight pipe 2 and the socket member 17 are integrated in mutually fitted relation.
  • a shaping inner mold 19 having an outer diameter conforming to the inner surface shape of a socket section 1 to be shaped is positioned outwardly of the straight pipe one end portion 2a, an elastic member 4 is adhesively secured to the outer surface of said straight pipe one end portion 2a, and a press mold 18 enclosing and contacting a socket member 16 consisting of unset resin is fitted over said elastic member 4.
  • a suitable clearance 20 defined between the inner surface of the socket member 17 and the outer surface of the inner mold 19.
  • FIGS. 6a through 6c show a third embodiment.
  • the socket member 17 of unset resin in the second embodiment described above is replaced by a reinforcing material 22, such as glass fiber, wound at the socket member forming position and the straight pipe one end portion 2a is diametrically contracted by a press mold 23 having resin pouring ports.
  • resin is poured into said winding of reinforcing material to form a socket member 26. More particularly, as shown in FIG.
  • a shaping inner mold 24 having an outer diameter conforming to the shape of the inner surface of a socket section 1 is positioned outwardly of the straight pipe one end portion 2a, the reinforcing material 22 is wound around the outer surface of the straight pipe one end portion 2a and around the outer surface of the inner mold 24, and the press mold 23, which has a press portion 23a whose inner diameter will become smaller than the outer diameter of the straight pipe 2 when contracted and which has resin pouring ports 25 opening into the shaping portion 23b, is mounted so as to cover said winding of reinforcing material, said press mold 23 being then contracted. Resin is then poured through the pouring ports 25 to form the socket member 26.
  • the press mold 23 is unfolded and removed and the inner mold 24 is withdrawn, thereby providing a flexible pipe having a socket section in which the socket member 26 and the straight pipe 2 are integrated, as shown in FIG. 6c.
  • an elastic member 4 may be interposed between the socket member 26 and the straight pipe 2.
  • the wedge member 27 and the socket member 30 are adhesively secured together. More particularly, said wedge member 27 is formed of rubber or the like, said socket member 30 is enclosed, contacted and supported by a support outer mold 31, a support inner mold 32 abuts against the end face of the straight pipe one end portion 2a, and an adhesive is applied to the inclined outer surface 28 of the wedge member 27 and to the inclined inner surface 29 of the socket member 30, whereupon the support outer mold 31 is moved as indicated by an arrow in FIG. 7a to establish the condition shown in 7b. After the resin has set, the support outer mold 31 is moved in the direction opposite to the previous one and removed and the support inner mold 32 is withdrawn, thereby providing a flexible pipe having a socket section 1, as shown in FIG. 7c.
  • FIGS. 8a through 8c show a fifth embodiment.
  • an inner mold 33 is inserted into the straight pipe one end portion 2a and a support outer mold 35 enclosing and contacting a socket member 34 is positioned around the outer surface of the straight pipe one end portion 2a.
  • an elastic member 38 thicker than said clearance, as indicated by an arrow in FIG. 8a, after an adhesive is applied to the inner and outer surfaces of said elastic member.
  • the elastic member 38 has been elastically compressed.
  • the support outer and inner molds 35 and 33 are removed, thereby providing a flexible pipe having a socket section 1, as shown in FIG. 8c, in which a force corresponding to the compressive reaction of the elastic member 38 is acting to provide a force fit between the straight pipe one end portion 2a and the one end portion 36 of the socket member 36.
  • said inner mold 33 has been installed to serve as a guide for the insertion of the elastic member 38.
  • the support outer mold 35 serves to hold the socket member 34. When such support outer mold 35 is used, the one end portion of the socket member 36 will not diametrically expand even if subjected to the compressive reaction of the elastic member 38, said compressive reaction being counteracted solely by the straight pipe one end portion 2a.
  • the inner mold 33 be provided with a press portion 29 whose outer diameter is suitably smaller than the inner diameter of the straight pipe one end portion 2a, said press portion 39 being loosely fitted in the straight pipe one end portion 2a so that in the condition shown in FIG. 8b, the straight pipe one end portion 2a may not be diametrically contracted beyond a certain amount.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
US05/685,152 1975-05-13 1976-05-11 Method of producing flexible pipe with socket section Expired - Lifetime US4124422A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP50-57747 1975-05-13
JP50057747A JPS5834291B2 (ja) 1975-05-13 1975-05-13 カトウカンノウケグチブケイセイホウホウ

Publications (1)

Publication Number Publication Date
US4124422A true US4124422A (en) 1978-11-07

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ID=13064482

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/685,152 Expired - Lifetime US4124422A (en) 1975-05-13 1976-05-11 Method of producing flexible pipe with socket section

Country Status (7)

Country Link
US (1) US4124422A (nl)
JP (1) JPS5834291B2 (nl)
DE (1) DE2620639C3 (nl)
FR (1) FR2310853A1 (nl)
GB (1) GB1523073A (nl)
NL (1) NL170604C (nl)
SE (1) SE421185B (nl)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258855A (en) * 1979-07-05 1981-03-31 The Continental Group, Inc. Adhesive application of two-part container
US4280268A (en) * 1979-07-05 1981-07-28 The Continental Group, Inc. Adhesive application of two-part container
US4477302A (en) * 1981-04-27 1984-10-16 Teledyne Industries, Inc. Method of making shock cells
US4549919A (en) * 1981-07-06 1985-10-29 Societe Nationale Industrielle Et Aerospatiale Process for providing a metal connector fixed to a pipe of composite material and pipe thus made
US5180195A (en) * 1991-07-10 1993-01-19 Chevron Research And Technology Company Joint locking system for pipe
US5505898A (en) * 1992-01-06 1996-04-09 Kubota Corporation Plastic pipe and manufacturing method thereof
US20170191598A1 (en) * 2014-05-22 2017-07-06 Schlemmer Gmbh Coupling arrangement for a domestic appliance, a device for a domestic appliance, and a domestic appliance
US10947938B2 (en) * 2017-06-21 2021-03-16 Steere Enterprises, Inc. Air duct assembly with a secured seal
CN112590179A (zh) * 2020-12-14 2021-04-02 九江中科鑫星新材料有限公司 一种制备超高分子聚乙烯复合管的缩径机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809245A (nl) * 1978-09-11 1980-03-13 Wavin Bv Mofbuisdeel met aangegoten vasthoudring.
JPS55115682A (en) * 1979-02-27 1980-09-05 Sekisui Chemical Co Ltd Manufacture of pipe with socket
JPS5628814A (en) * 1979-08-17 1981-03-23 Sekisui Chem Co Ltd Manufacture of socket pipe
CH677522A5 (nl) * 1988-11-10 1991-05-31 Hobas Eng & Durotec Ag
SE502146C2 (sv) * 1991-11-05 1995-08-28 Goeran Anderberg Tätningsarrangemang vid axelgenomföringar

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Publication number Priority date Publication date Assignee Title
US3036948A (en) * 1959-06-04 1962-05-29 Us Rubber Co Adhesion of polyester fiber directly to butyl rubber by means of epoxy resin
US3149861A (en) * 1958-10-01 1964-09-22 Larsson Gunnar Tube coupling
US3217400A (en) * 1959-03-10 1965-11-16 Illesy Otto Method of connecting thermoplastic pipe sections and the like
US3770480A (en) * 1970-05-25 1973-11-06 Farnam F Co Method of making coated gaskets
US3953059A (en) * 1974-10-21 1976-04-27 Phillips Petroleum Company Pipe connection and process to make same
US3969170A (en) * 1971-10-22 1976-07-13 Mannesmann Aktiengesellschaft Method for making a thermoplastic sleeve to be used as coupler fitting for tubes
US3971578A (en) * 1974-08-16 1976-07-27 Scovill Manufacturing Company Union device for flexible tubing

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JPS5141582B1 (nl) * 1968-03-29 1976-11-10
FR1569085A (nl) * 1968-04-11 1969-05-30

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149861A (en) * 1958-10-01 1964-09-22 Larsson Gunnar Tube coupling
US3217400A (en) * 1959-03-10 1965-11-16 Illesy Otto Method of connecting thermoplastic pipe sections and the like
US3036948A (en) * 1959-06-04 1962-05-29 Us Rubber Co Adhesion of polyester fiber directly to butyl rubber by means of epoxy resin
US3770480A (en) * 1970-05-25 1973-11-06 Farnam F Co Method of making coated gaskets
US3969170A (en) * 1971-10-22 1976-07-13 Mannesmann Aktiengesellschaft Method for making a thermoplastic sleeve to be used as coupler fitting for tubes
US3971578A (en) * 1974-08-16 1976-07-27 Scovill Manufacturing Company Union device for flexible tubing
US3953059A (en) * 1974-10-21 1976-04-27 Phillips Petroleum Company Pipe connection and process to make same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258855A (en) * 1979-07-05 1981-03-31 The Continental Group, Inc. Adhesive application of two-part container
US4280268A (en) * 1979-07-05 1981-07-28 The Continental Group, Inc. Adhesive application of two-part container
US4477302A (en) * 1981-04-27 1984-10-16 Teledyne Industries, Inc. Method of making shock cells
US4549919A (en) * 1981-07-06 1985-10-29 Societe Nationale Industrielle Et Aerospatiale Process for providing a metal connector fixed to a pipe of composite material and pipe thus made
US5180195A (en) * 1991-07-10 1993-01-19 Chevron Research And Technology Company Joint locking system for pipe
US5505898A (en) * 1992-01-06 1996-04-09 Kubota Corporation Plastic pipe and manufacturing method thereof
US20170191598A1 (en) * 2014-05-22 2017-07-06 Schlemmer Gmbh Coupling arrangement for a domestic appliance, a device for a domestic appliance, and a domestic appliance
US10738930B2 (en) * 2014-05-22 2020-08-11 Schlemmer Gmbh Coupling arrangement for a domestic appliance, a device for a domestic appliance, and a domestic appliance
US10947938B2 (en) * 2017-06-21 2021-03-16 Steere Enterprises, Inc. Air duct assembly with a secured seal
CN112590179A (zh) * 2020-12-14 2021-04-02 九江中科鑫星新材料有限公司 一种制备超高分子聚乙烯复合管的缩径机

Also Published As

Publication number Publication date
GB1523073A (en) 1978-08-31
DE2620639C3 (de) 1979-11-08
SE421185B (sv) 1981-12-07
FR2310853B1 (nl) 1980-09-05
FR2310853A1 (fr) 1976-12-10
DE2620639B2 (de) 1979-03-15
JPS5834291B2 (ja) 1983-07-26
NL170604C (nl) 1982-12-01
JPS51132283A (en) 1976-11-17
NL7604713A (nl) 1976-11-16
DE2620639A1 (de) 1976-11-18
SE7605294L (sv) 1976-11-14

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